FIR: reproduce KT-42656

compiler/testData/codegen/box/callableReference/javaField.kt

@@ -0,0 +1,27 @@
+// IGNORE_BACKEND_FIR: JVM_IR
+// TARGET_BACKEND: JVM
+// WITH_RUNTIME
+
+// FILE: JClass.java
+
+import java.util.Arrays;
+import java.util.Set;
+import java.util.HashSet;
+
+public class JClass {
+    public final Set<String> field;
+
+    public JClass(String... ins) {
+        field = new HashSet<String>(Arrays.asList(ins));
+    }
+}
+
+// FILE: main.kt
+
+fun collect(lst: List<JClass>): String {
+    return lst.flatMap(JClass::field).joinToString(separator = "")
+}
+
+fun box(): String {
+    return collect(listOf(JClass("O"), JClass("K")))
+}